1st 3 freeze happend while driving my car on hot days.
I did a hard reset tuesday night as the watch crashed just before the training that day. I could start it again after a while.
Today, it happend three times : at the end of a bike commute, just before a trail run. I has to reboot the watch, it went ok for most of the session but the screen shut itself at the end of the session, then after a while, the watch started again, but the language was strange as if the translation were all mixed up.
I couldnt save the session as I couldnt find the save option.
it happend again on the comute back home, and had to reboot the watch.